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Chiral-partner D mesons in a heat bath within QCD sum rules
Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden, Germany;Helmholtz Zentrum Dresden Rossendorf, PF 510119, D-01314 Dresden, Germany.
Austrian Acad Sci, Inst High Energy Phys, A-1050 Vienna, Austria;Karl Franzens Univ Graz, Inst Phys, NAWI Graz, A-8010 Graz, Austria.
Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden, Germany;Helmholtz Zentrum Dresden Rossendorf, PF 510119, D-01314 Dresden, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
2018 (English)In: Journal of Physics G: Nuclear and Particle Physics, ISSN 0954-3899, E-ISSN 1361-6471, Vol. 45, no 8, article id 085104Article in journal (Refereed) Published
Abstract [en]

Utilizing QCD sum rules, we extract the temperature dependences of the spectral properties of the pseudo-scalar and scalar D mesons regarded as chiral partners. Besides the masses also decay constants are analyzed as the D meson yields in heavy-ion collisions may be sensitive to their altered decay properties in an ambient strongly interacting medium. Our findings are (i) a decreasing scalar D meson mass for growing temperatures while its pseudo-scalar partner meson seems hardly affected, which is in qualitative agreement with hadronic model calculations; (ii) inferring an equally weak temperature dependence of the pseudo-scalar D meson decay properties the decreasing residua and decay constants of the scalar particle point towards partial chiral restoration. As a bonus of our analysis in the pseudo-scalar sector we determine the pseudoscalar decay constant at vanishing temperature. Due to the connection to particular leptonic branching fractions this decay constant is of great interest allowing for the determination of the off-diagonal CKM matrix element vertical bar V-cd vertical bar at zero temperature.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2018. Vol. 45, no 8, article id 085104
Keywords [en]
QCD, sum rules, chiral partners, D meson, finite temperature
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-361039DOI: 10.1088/1361-6471/aab44eISI: 000438204300001OAI: oai:DiVA.org:uu-361039DiVA, id: diva2:1249879
Available from: 2018-09-20 Created: 2018-09-20 Last updated: 2018-09-20Bibliographically approved

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Leupold, Stefan

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